Segments and Geographic Area Analysis - Revenues from Major Customers that Contributed More than 10% of Total Revenues (Detail) (Revenues [Member])	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Petrobras Brasileiro S.A. [Member]
Revenue, Major Customer [Line Items]
Percentage of revenues from major customers	33.60%	33.30%	35.00%
OGX Petroleo e Gas Ltda. [Member]
Revenue, Major Customer [Line Items]
Percentage of revenues from major customers	2.40%	12.50%	14.10%